Updated Release notes for 3.1 release
Updated Release notes for 3.1 release

Added info about DAX Parser autoloading and made more explicit the
move to the --conf options.



pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus